No i havent. I'm not so active member of forums, so i havent practice that. Just now opened account. But I've readed a lot about sign-profit in other forums. It has problems sometimes - sometimes some money dissaperar from signprofit account. Sometimes is hard to withdraw, but not everytime. The last news is ok. People says it's paying again.
Anyway there is nothing to loose. Just put on signature, and it works

withdraw at $0.5 - not long to wait.
Yes, i saw moneydiscuss.com on approved sign-profit list,
just dont know its good or bad, because it can attract more spammers, as happening in other forums.